Code Cleanup: (Bump(), Bumped()) -> (Collide(), CollidedWith()) (#4349)

This PR rips out the old Bump() and Bumped() procs and replaces them with Collide() and CollidedWith() respectively. Behavior should be the same, but Bump() should no longer be double-called, and no longer relies on spawns.

Other changes:

LAssailant is now a weakref.
Some direct loc setting are now forceMove().

code/modules/research/xenoarchaeology/artifact/artifact.dm

@@ -105,9 +105,8 @@
 				"<span class='notice'>[src] has been whittled away under your careful excavation, but there was nothing of interest inside.</span>")
 			qdel(src)
 
-/obj/structure/boulder/Bumped(AM)
+/obj/structure/boulder/CollidedWith(AM)
 	. = ..()
-
 	if(istype(AM,/mob/living/carbon/human))
 		var/mob/living/carbon/human/H = AM
 		if((istype(H.l_hand,/obj/item/weapon/pickaxe)) && (!H.hand))

code/modules/research/xenoarchaeology/artifact/artifact_gigadrill.dm

@@ -20,7 +20,8 @@
 		icon_state = "gigadrill_mov"
 		user << "<span class='notice'>You press a button and [src] shudders to life.</span>"
 
-/obj/machinery/giga_drill/Bump(atom/A)
+/obj/machinery/giga_drill/Collide(atom/A)
+	. = ..()
 	if(active && !drilling_turf)
 		if(istype(A,/turf/simulated/mineral))
 			var/turf/simulated/mineral/M = A

code/modules/research/xenoarchaeology/artifact/artifact_unknown.dm

@@ -84,7 +84,7 @@
 		secondary_effect.process()
 
 	if(pulledby)
-		Bumped(pulledby)
+		CollidedWith(pulledby)
 
 	//if either of our effects rely on environmental factors, work that out
 	var/trigger_cold = 0
@@ -254,7 +254,7 @@
 		if(secondary_effect && secondary_effect.trigger == TRIGGER_FORCE && prob(25))
 			secondary_effect.ToggleActivate(0)
 
-/obj/machinery/artifact/Bumped(M as mob|obj)
+/obj/machinery/artifact/CollidedWith(M as mob|obj)
 	..()
 	if(istype(M,/obj))
 		if(M:throwforce >= 10)

code/modules/research/xenoarchaeology/finds/finds_special.dm

@@ -223,5 +223,6 @@
 	else
 		STOP_PROCESSING(SSprocessing, src)
 
-/obj/effect/shadow_wight/Bump(var/atom/obstacle)
+/obj/effect/shadow_wight/Collide(var/atom/obstacle)
+	. = ..()
 	obstacle << "<span class='warning'>You feel a chill run down your spine!</span>"